ZooKeeper实践三:伪集群安装
系统环境(本次环境)
准备一台Linux服务器,系统要求如下:
Linux: CentOS 6.5 64bit Server
Java: 1.7.0_60 64-Bit Server VM
ZooKeeper 使用Java语言编写,运行环境需要Java环境支持,建议使用JDK1.6以上版本。Java环境请自行配置。
下载ZooKeeper
下载ZooKeeper,本次使用的版本:zookeeper-3.4.5.tar.gz
将安装文件解压至某一目录:/usr/zookeeper-3.4.5
#tar zxvf zookeeper-3.4.5.tar.gz
配置ZooKeeper
1)分别创建数据目录
#mkdir /var/zookeeperdata1
#mkdir /var/zookeeperdata2
#mkdir /var/zookeeperdata3
2)分别在数据目录中创建myid文件,并添加id值
#echo "1" > /var/zookeeperdata1/myid
#echo "2" > /var/zookeeperdata2/myid
#echo "3" > /var/zookeeperdata3/myid
3)分别修改配置文件
#cd /usr/zookeeper-3.4.5/conf
#cp zoo_sample.cfg zk1.cfg
#vi zk1.cfg
tickTime=2000
initLinmit=10
syncLimit=5
dataDir=/var/zookeeperdata1
clientPort=2181
server.1=server IP:2888:3888
server.2=server IP:2889:3889
server.3=server IP:2890:3890
#cp zoo_sample.cfg zk2.cfg
#vi zk2.cfg
tickTime=2000
initLinmit=10
syncLimit=5
dataDir=/var/zookeeperdata2
clientPort=2182
server.1=server IP:2888:3888
server.2=server IP:2889:3889
server.3=server IP:2890:3890
#cp zoo_sample.cfg zk3.cfg
#vi zk3.cfg
tickTime=2000
initLinmit=10
syncLimit=5
dataDir=/var/zookeeperdata3
clientPort=2183
server.1=server IP:2888:3888
server.2=server IP:2889:3889
server.3=server IP:2890:3890
dataDir分别指向各自数据目录,clientPort使用不同端口。
增加集群实例到配置文件中,server.X中”X”表示每个数据目录中的myid的值,server也使用不同端口。
4)设置ZooKeeper环境变量(可选操作,方便操作,推荐配置)
#vi /etc/profile
export ZOOKEEPER_HOME=/usr/zookeeper-3.4.5
export PATH=$PATH:$ZOOKEEPER_HOME/bin:$ZOOKEEPER_HOME/conf
分别启动ZooKeeper
需要指定配置文件
#zkServer.sh start zk1.cfg
#zkServer.sh start zk2.cfg
#zkServer.sh start zk3.cfg
查看运行状态
需要指定配置文件
#zkServer.sh status zk1.cfg
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zk1.cfg
Mode: leader
#zkServer.sh status zk2.cfg
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zk2.cfg
Mode: follower
#zkServer.sh status zk3.cfg
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zk3.cfg
Mode: follower
我们看到有一台Server为leader,其余为follower。
查看ZooKeeper物理文件目录结构
#tree –L 3 /var/zookeeperdata1
/var/zookeeperdata1
├── myid
├── version-2
│ ├── acceptedEpoch
│ ├── currentEpoch
│ └── snapshot.0
└── zookeeper_server.pid
#tree –L 3 /var/zookeeperdata2
/var/zookeeperdata2
├── myid
├── version-2
│ ├── acceptedEpoch
│ ├── currentEpoch
│ └── snapshot.0
└── zookeeper_server.pid
#tree –L 3 /var/zookeeperdata3
/var/zookeeperdata3
├── myid
├── version-2
│ ├── acceptedEpoch
│ ├── currentEpoch
│ └── snapshot.0
└── zookeeper_server.pid
停止ZooKeeper
#zkServer.sh stop zk1.cfg
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zk1.cfg
Stooping zookeeper … STOPPED
#zkServer.sh stop zk2.cfg
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zk2.cfg
Stooping zookeeper … STOPPED
#zkServer.sh stop zk3.cfg
JMX enabled by default
Using config: /usr/zookeeper-3.4.5/bin/../conf/zk3.cfg
Stooping zookeeper … STOPPED